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IPv4 Subnet Calculator

Enter an IP with a CIDR prefix or a subnet mask to see its network, broadcast, host range, and host count. You can also split the network into smaller subnets.

$ ipcalc
Try:192.168.1.10/2410.0.0.0/8172.16.5.4/20203.0.113.9/29
IPv6 calculator →
private IP (RFC 1918)10.2.38.0/23
network10.2.38.0/23
broadcast10.2.39.255
first host10.2.38.1
last host10.2.39.254
subnet mask255.255.254.0
wildcard0.0.1.255
addresses512
usable hosts510
classA
ipcalc 10.2.38.0/23
address00001010.00000010.00100110.00000000
subnet mask11111111.11111111.11111110.00000000
network00001010.00000010.00100110.00000000
broadcast00001010.00000010.00100111.11111111
green = network part, grey = host part
hex0x0a022600
decimal167912960
reverse dns0.38.2.10.in-addr.arpa
ipv4-mapped::ffff:a02:2600

/23 split into /29 · 64 subnets

close ×
#networkhost rangebroadcast
110.2.38.0/2910.2.38.1 – 10.2.38.610.2.38.7
210.2.38.8/2910.2.38.9 – 10.2.38.1410.2.38.15
310.2.38.16/2910.2.38.17 – 10.2.38.2210.2.38.23
410.2.38.24/2910.2.38.25 – 10.2.38.3010.2.38.31
510.2.38.32/2910.2.38.33 – 10.2.38.3810.2.38.39
610.2.38.40/2910.2.38.41 – 10.2.38.4610.2.38.47
710.2.38.48/2910.2.38.49 – 10.2.38.5410.2.38.55
810.2.38.56/2910.2.38.57 – 10.2.38.6210.2.38.63
910.2.38.64/2910.2.38.65 – 10.2.38.7010.2.38.71
1010.2.38.72/2910.2.38.73 – 10.2.38.7810.2.38.79
1110.2.38.80/2910.2.38.81 – 10.2.38.8610.2.38.87
1210.2.38.88/2910.2.38.89 – 10.2.38.9410.2.38.95
1310.2.38.96/2910.2.38.97 – 10.2.38.10210.2.38.103
1410.2.38.104/2910.2.38.105 – 10.2.38.11010.2.38.111
1510.2.38.112/2910.2.38.113 – 10.2.38.11810.2.38.119
1610.2.38.120/2910.2.38.121 – 10.2.38.12610.2.38.127
1710.2.38.128/2910.2.38.129 – 10.2.38.13410.2.38.135
1810.2.38.136/2910.2.38.137 – 10.2.38.14210.2.38.143
1910.2.38.144/2910.2.38.145 – 10.2.38.15010.2.38.151
2010.2.38.152/2910.2.38.153 – 10.2.38.15810.2.38.159
2110.2.38.160/2910.2.38.161 – 10.2.38.16610.2.38.167
2210.2.38.168/2910.2.38.169 – 10.2.38.17410.2.38.175
2310.2.38.176/2910.2.38.177 – 10.2.38.18210.2.38.183
2410.2.38.184/2910.2.38.185 – 10.2.38.19010.2.38.191
2510.2.38.192/2910.2.38.193 – 10.2.38.19810.2.38.199
2610.2.38.200/2910.2.38.201 – 10.2.38.20610.2.38.207
2710.2.38.208/2910.2.38.209 – 10.2.38.21410.2.38.215
2810.2.38.216/2910.2.38.217 – 10.2.38.22210.2.38.223
2910.2.38.224/2910.2.38.225 – 10.2.38.23010.2.38.231
3010.2.38.232/2910.2.38.233 – 10.2.38.23810.2.38.239
3110.2.38.240/2910.2.38.241 – 10.2.38.24610.2.38.247
3210.2.38.248/2910.2.38.249 – 10.2.38.25410.2.38.255
3310.2.39.0/2910.2.39.1 – 10.2.39.610.2.39.7
3410.2.39.8/2910.2.39.9 – 10.2.39.1410.2.39.15
3510.2.39.16/2910.2.39.17 – 10.2.39.2210.2.39.23
3610.2.39.24/2910.2.39.25 – 10.2.39.3010.2.39.31
3710.2.39.32/2910.2.39.33 – 10.2.39.3810.2.39.39
3810.2.39.40/2910.2.39.41 – 10.2.39.4610.2.39.47
3910.2.39.48/2910.2.39.49 – 10.2.39.5410.2.39.55
4010.2.39.56/2910.2.39.57 – 10.2.39.6210.2.39.63
4110.2.39.64/2910.2.39.65 – 10.2.39.7010.2.39.71
4210.2.39.72/2910.2.39.73 – 10.2.39.7810.2.39.79
4310.2.39.80/2910.2.39.81 – 10.2.39.8610.2.39.87
4410.2.39.88/2910.2.39.89 – 10.2.39.9410.2.39.95
4510.2.39.96/2910.2.39.97 – 10.2.39.10210.2.39.103
4610.2.39.104/2910.2.39.105 – 10.2.39.11010.2.39.111
4710.2.39.112/2910.2.39.113 – 10.2.39.11810.2.39.119
4810.2.39.120/2910.2.39.121 – 10.2.39.12610.2.39.127
4910.2.39.128/2910.2.39.129 – 10.2.39.13410.2.39.135
5010.2.39.136/2910.2.39.137 – 10.2.39.14210.2.39.143
5110.2.39.144/2910.2.39.145 – 10.2.39.15010.2.39.151
5210.2.39.152/2910.2.39.153 – 10.2.39.15810.2.39.159
5310.2.39.160/2910.2.39.161 – 10.2.39.16610.2.39.167
5410.2.39.168/2910.2.39.169 – 10.2.39.17410.2.39.175
5510.2.39.176/2910.2.39.177 – 10.2.39.18210.2.39.183
5610.2.39.184/2910.2.39.185 – 10.2.39.19010.2.39.191
5710.2.39.192/2910.2.39.193 – 10.2.39.19810.2.39.199
5810.2.39.200/2910.2.39.201 – 10.2.39.20610.2.39.207
5910.2.39.208/2910.2.39.209 – 10.2.39.21410.2.39.215
6010.2.39.216/2910.2.39.217 – 10.2.39.22210.2.39.223
6110.2.39.224/2910.2.39.225 – 10.2.39.23010.2.39.231
6210.2.39.232/2910.2.39.233 – 10.2.39.23810.2.39.239
6310.2.39.240/2910.2.39.241 – 10.2.39.24610.2.39.247
6410.2.39.248/2910.2.39.249 – 10.2.39.25410.2.39.255
01 / table

IPv4 CIDR prefix table.

Click a prefix longer than your network to split it into subnets.

prefixsubnet maskaddresseshostsin your /23
/00.0.0.04,294,967,2964,294,967,294-
/1128.0.0.02,147,483,6482,147,483,646-
/2192.0.0.01,073,741,8241,073,741,822-
/3224.0.0.0536,870,912536,870,910-
/4240.0.0.0268,435,456268,435,454-
/5248.0.0.0134,217,728134,217,726-
/6252.0.0.067,108,86467,108,862-
/7254.0.0.033,554,43233,554,430-
/8255.0.0.016,777,21616,777,214-
/9255.128.0.08,388,6088,388,606-
/10255.192.0.04,194,3044,194,302-
/11255.224.0.02,097,1522,097,150-
/12255.240.0.01,048,5761,048,574-
/13255.248.0.0524,288524,286-
/14255.252.0.0262,144262,142-
/15255.254.0.0131,072131,070-
/16255.255.0.065,53665,534-
/17255.255.128.032,76832,766-
/18255.255.192.016,38416,382-
/19255.255.224.08,1928,190-
/20255.255.240.04,0964,094-
/21255.255.248.02,0482,046-
/22255.255.252.01,0241,022-
/23255.255.254.05125101
/24255.255.255.02562542 split →
/25255.255.255.1281281264 split →
/26255.255.255.19264628 split →
/27255.255.255.224323016 split →
/28255.255.255.240161432 split →
/29255.255.255.2488664 split →
/30255.255.255.25242128 split →
/31255.255.255.25422256 split →
/32255.255.255.25511512 split →
02 / faq

About this calculator.

How do I use this subnet calculator?

▼

Type an IP address followed by a prefix, like 192.168.1.10/24, or by a subnet mask, like 192.168.1.10 255.255.255.0. Without a prefix it uses /24. Click a row in the table to split the network into smaller subnets.

Why are usable hosts always 2 fewer?

▼

The first address in a subnet is the network address and the last is the broadcast address, so neither can go to a device. The exceptions are /31 (point-to-point links, RFC 3021) and /32 (a single address), which use every address.

Can I use it from a terminal?

▼

Yes. curl 'ipku.in/en/tools/ipv4-subnet-calculator?q=192.168.1.10/24' returns the result as plain text.

Learn how to work it out →